Pencil-sharpening device.



REINHART W. PITTMAN, OF NEW YORK, N. Y. l

PENCIL-SHARPENING DEVICE.

Specification of Letters Patent. Patented NOV, 16, 1909.

Application filed November 23, 1908. Serial No. 464,072.

.lb all whom 'it may concern:

Be it known that I, REINHART WV. PITT- MAN, ofthe borough of Manhattan, city and State of New York, have invented a certain new and useful Improvement in Pencil- Sharpening Devices, offwhich the following is a speciiicat-ion.

The subject-matter of this invention pertains to a pencil Sharpener simple in construction, cheap of manufacture, eflicient in operation and 1n the use of which a large or small pencil may be given a desired sharpness or bluntnessof point. Y

In the drawing' accompanying the present specification, Figure l is an elevation of a pencil Sharpener embodying my present im- .the pencil socket.

provements. Fig. 2 is a cross section on the plane of the line representing the aXis of F ig'. 3 is a plan View of Fig. l. Fig. 4 is a detail view looking ,at the side of the device opposite to that/represented in Fig. l. Fig. 5 is a pla 'of the notched wheel or annulus and encircled sleeve, the inwardly extending spring lingers on which serve to rotate the pencil during the cutting operation but leaving it free to slide axially. Fig. 6 is a perspective view of such sleeve. Fig. 7 is a cross section illustrating in an exaggerated way armodilied construction for holding the cutting blade or knife to its cut. Fig. 8 illustrates a worm for rotating the pencil in such a manner that the rotation of the pencil is suspended duri g the cuttingoperation.

Similar c iaracters of reference designate corresponding parts in all figures.

A suitable base piece supports the various operative parts of the device, this piece here consisting of an u )right portion 2 and a laterally extending toot portion 2. A pencil socket is formed in a boss 22 of the upright 2, this socket having an upper cylindrical part 3 anda lower conical part 3. The axis ofthe pencil socket is disposed' at such an angle tothe outer face of upright 2 that the lower part of the inserted pencil to be sharpened will protrude somewhat through an opening 4, therein and -beyond the'outer' plane of such upright. Mounted in a bearllng 5 transverse to said plane of the upright is a shaft 6 carrying at the end indicated an arm 6a provided with a crank pin 6 and at the opposite end a crank handle (i2 which may be engaged with the threaded end (3" of the shaft, as shown. Hung from crank pin `6 is a carrier 7 provided with a cutting blade 7', here shown as removablysecured Vto the carrier by a screw 72. The carrier movement is preferablyso controlled that the cutting blade thereon is given a,sweep ing movement across o ening 4c at an angle to the cutting edge. Tliis may be done as in Fig l by a swinging link 8 pivoted at one endl to the carrier and at the other end to a pin 8 on upright 2. The cutting blade may be held to its cut by an out-board gib 9 secured to upright 2 or preferably by twisting link 8 as in Fig. 7 to give thereto sutlicient resiliency for the purpose.

Rotatably mounted in the pencil socket is a sleeve 10, of sufficient diameter to receive the largest pencil to be sharpened by the device. An inserted pencil is compelled to rotate with the sleeve by means of inwardly extendingv spring fingers l0 althou h the pencil is free to slide lengthwise un er the drag of the cutting. blade.

Secured to the sleeve as by soldering or a forced fit is a notched wheel 11 which engages with the thread'of a worm 12 on shaft 6 which latter therefore during its rotation slowly turns the pencil in the socket. Preferably notched wheel l1 and its engaging worm are so related that the downwardly acting force component oi'I the rotating worin thread tends t-o hold the sleeve in place. If

be so related to the other features of the device that the rotation of the pencil is suspended during theaetual cutting operation. As the pointed end ot the pencil is gradually sharpened by the rcnioval of chips, the pencil descends until th'c lead colnes to rest upon a suitable stop when the pencil ceases to descend and the operation of sharpening is vsuspended although the knife continues to sweep across opening 4.

()ne of the features of the invention consists of an adjustable stop whereby the descent of the pencil may be arrested when the extreme point thereot has reached a predetermined point above the intersection of the 'axis of the pencil with the plane of the face ol upright 2 whereby the lead ofthe pencil maybe sharpened to the desired-degree of lineness. The slop is here constituted by the laterally bent rnd ll ot' a lever lll;

pivoted by pin 142 to upright 2 end retained in any desired one of a number of positions by the resilience of the lever which enables it'to be sprung into and out of any one of n number of recesses lei-3. A rear bearing l5 for the pencil point is secured to the outside of the pencil socket in such a position that its free end l5 supports the pencil tip against the sidethrust of the cut, this free end passing through an opening` 152 in stop 14:.

Having described inyinvention7 l claim :H

l; iin e pencil sharpening device, the conlbination of a base piece provided with e. pencil socket, a cutting blade, e cutting blade carrier, an operating crank shaft provided With a crank pin from which said carrier hung, a swinging link pivoted at one end to the base piece and et the opposite end to the carrer,-seid link being resilient and twisted for thef lpurpose of holding the blade to its cut durinrY the cutting operation and ineens for rotating e pencil in said socket.

elders 2. In a pencil sharpening deviceythe conv binetion elf e bese piece provided vs'ith e z, pencil socket, n cutting blade, u, cutting blade carrier, an operating crank shalt proridl-Ld with e crank pin from which seid carrier is hung;7 u swinging linli pii'cted :it one cnil to the base piece und at the opposite end te the (in carrier said link being resilient und tw' l for the purpose of holding' the blade lo i cut during` the cutting` 'iiileiation, :i sleeve rotumble in seid socket und provided with inwardly };)1'oje 'fti1ig spring' iingers l t ing` :i pencil, e 'worin und worin wl "vor rotating; the sleeve, und en ndi ile i for limiting the descent of the pene pencil socket.

In witness whereof l' have signed th' specification in the presence of t ve subsi; ing- Witnesses1 tEllllii'lll FV. Pl. "TMA Witnesses l). L. lffnilts,

FRED VlTonnL. 

